Swim fin



FIG. 1 is a perspective view of a swim fin showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an end elevational view looking from the heel section;

FIG. 5 is a cross sectional view through a midline section of FIG. 3; and

FIG. 6 is a midline sectional view taken through the midline of FIG. 1. 

The ornamental design for a swim fin, as shown and described. 